1.	Which of the following numbers is composite?
		A.	1	B.	9
		C.	23	D.	31
		Hint
	2.	Write the prime factorization of 1500.
		A.	22 × 3 × 52	B.	22 × 3 × 53
		C.	2 × 3 × 5	D.	22 × 3 × 52 × 102
		Hint
	3.	Find the prime factorization of 105.
		A.	5 × 15	B.	3 × 5 × 7
		C.	2 × 5 × 7	D.	5 × 21
		Hint
	4.	Find 5 × 9 × 4 mentally.
		A.	156	B.	180
		C.	594	D.	45
		Hint
	5.	Find 102 + 57 + 98 mentally.
		A.	159	B.	257
		C.	261	D.	167
		Hint